33-year-old Hong Kong policewoman Situ Mulin (Sammi Cheng) has been worrying about her marriage. Her boyfriend's promise ten years ago has now become a joke between her and her colleagues. One day, the son of Huo Qingsong (Eason Chan), the leader of the smuggling group, was kidnapped, and Situ Mulin was ordered to handle the case. But in order to avoid being charged by the police for smuggling, Huo Qingsong's family showed an uncooperative attitude everywhere, and at this time Situ Mulin found out that she was pregnant. The black and white sides are at odds in a big house, and the Huo family has their own secret plans. At the same time, the mainland police also received news of a joint investigation. As a "leftover woman" and a police officer, can Situ Mulin solve everything she faces?